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Acoustic air diffusers for ventilation are specially designed metal diffusers intended for air supply and extraction where reducing ventilation noise is important. They are used in mechanical ventilation and heat recovery systems in houses, apartments, offices and other premises. The el-vent.com range includes four Silent series: universal DPN diffusers, DPNN supply air diffusers and DIN and DINN extract air diffusers. All models have adjustable airflow dampers, while DPNN and DINN feature connection spigots with sealing gaskets. DPNN additionally allows supply air direction to be adjusted. Available diameters range from Ø80 to Ø200 mm, depending on the series.
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Acoustic air diffusers are specially designed ventilation components used to distribute supply air or collect extract air while helping reduce noise generated by moving air. They are suitable for mechanical ventilation and heat recovery systems where both the required airflow and acoustic comfort are important.
As air passes through a diffuser, pressure loss occurs and aerodynamic noise may be generated. Noise levels depend on airflow volume, velocity, diffuser construction and damper position. Acoustic diffusers use specially designed valves to help reduce airflow noise.
The el-vent.com range includes four Silent series: DPN, DPNN, DIN and DINN. All four provide airflow adjustment, but differ in application, connection design and additional functions.
Silent DPN are round metal diffusers suitable for both air supply and extraction. They are made from galvanised steel and powder-coated in white RAL9016.
The special valve construction helps reduce airflow noise. An integrated adjustable damper allows the airflow volume to be set according to the ventilation system requirements.
Available Silent DPN diameters: Ø80, Ø100, Ø125, Ø160 and Ø200 mm.
This universal series is suitable when the same diffuser appearance is desired at both supply and extract openings. Manufacturer documentation includes pressure loss, sound pressure level and sound attenuation data.
Silent DPNN are metal acoustic diffusers designed specifically for supply air. They have a connection spigot with a sealing gasket, an adjustable airflow damper and an additional damper for changing the direction of supply air.
Directional adjustment is useful when airflow distribution must be adapted to the room layout. The special valve design helps reduce aerodynamic noise. The diffusers have a white RAL9016 powder-coated finish.
Available Silent DPNN diameters: Ø100, Ø125 and Ø160 mm.
Technical documentation includes sound pressure level, sound attenuation and pressure loss information for assessing performance under specified operating conditions.
Silent DIN are round metal diffusers designed for extracting air from rooms. Their special valve construction helps reduce system noise, while an adjustable damper allows the extract air volume to be regulated.
The diffusers are powder-coated in white RAL9016. They are intended for extract ventilation systems where efficient air removal and acoustic comfort are important.
Available Silent DIN diameters: Ø100, Ø125, Ø160 and Ø200 mm.
Silent DIN should be selected for openings intended to remove air from the room according to the ventilation design.
Silent DINN are acoustic metal diffusers designed for air extraction. They differ from the DIN series by having a connection spigot with a sealing gasket.
This arrangement helps provide a tighter connection to a compatible round duct. The special valve construction helps reduce airflow noise, and an adjustable damper controls the extract airflow. The diffusers are powder-coated in RAL9016.
Available Silent DINN diameters: Ø100, Ø125 and Ø160 mm.
Manufacturer documentation includes sound pressure level, sound attenuation and pressure loss data. Actual connection airtightness also depends on correct installation.
| Series | Application | Diameters | Key features |
|---|---|---|---|
| Silent DPN | Supply and extraction | Ø80–Ø200 mm | Universal, adjustable airflow |
| Silent DPNN | Supply air | Ø100–Ø160 mm | Sealing gasket, directional adjustment |
| Silent DIN | Extract air | Ø100–Ø200 mm | Adjustable extract airflow |
| Silent DINN | Extract air | Ø100–Ø160 mm | Sealing gasket, adjustable airflow |
All four series are acoustic diffusers with a white RAL9016 powder-coated finish. The diameter ranges do not imply that every intermediate size is available; check the individual series for exact sizes.
Ventilation noise may originate from fans, ductwork, regulating dampers and air terminals. Acoustic diffuser construction helps reduce noise associated with airflow through the diffuser, but cannot eliminate all sources of system noise.
Two technical parameters should be distinguished:
Manufacturer tables provide values for different frequency bands. A reliable acoustic assessment must consider the specific model, airflow, pressure loss and installation conditions.
Choose Silent DPN for a universal diffuser suitable for both airflow directions. Silent DPNN is intended for supply air with additional directional adjustment. Silent DIN and DINN are designed for extract ventilation only.
The range covers nominal diameters from Ø80 to Ø200 mm. DPN is available in Ø80, Ø100, Ø125, Ø160 and Ø200 mm; DPNN in Ø100, Ø125 and Ø160 mm; DIN in Ø100, Ø125, Ø160 and Ø200 mm; and DINN in Ø100, Ø125 and Ø160 mm.
The selected diameter must match the duct or connection fitting. Check the specific model's dimensional drawing before ordering.
Diffuser size must be matched to the design airflow (m³/h). An undersized opening or a heavily restricted damper can increase air velocity, pressure loss and aerodynamic noise.
Use manufacturer airflow and pressure loss characteristics where available when selecting the appropriate model.
Bedrooms, children's rooms, offices and other noise-sensitive areas require particular attention to operating noise levels. Acoustic diffusers can help reduce noise, but the fan, duct system, airflow and installation also affect the final result.
DPNN and DINN have gasketed connection spigots. These are useful where a sealed duct connection and straightforward fitting into a compatible round duct are important.
When comparing DPN with DPNN or DIN with DINN, consider the connection arrangement and adjustment functions in addition to price and diameter.
Acoustic air diffusers have specially designed valve constructions intended to reduce airflow noise. Silent models also offer airflow adjustment, while certain versions include sealing gaskets or air direction control.
Conventional metal air diffusers may also regulate airflow, but their construction is not necessarily optimised for acoustic performance.
Selection should be based on the ventilation design. An acoustic diffuser alone cannot guarantee quiet operation if air velocity is excessive or other system components generate significant noise.
It is a specially designed ventilation component used for air supply or extraction while helping reduce noise generated by airflow.
No. They help reduce noise, but overall sound levels also depend on fans, ducts, air velocity, pressure loss and installation.
DPN is universal for supply and extraction. DPNN is designed for supply air and additionally has a gasketed connection spigot and a directional adjustment damper.
Both are designed for extraction. DINN additionally has a connection spigot with a sealing gasket, and their available diameter ranges differ.
Yes, provided their intended application, connection dimensions and technical performance meet the system design requirements.
Yes. Silent DPN is a universal series intended for both airflow directions.
Yes. It includes an additional damper for changing the direction of supply air.
The manufacturer specifies these series for extraction. Select a suitable supply air diffuser for supply openings.
Yes. All four series feature adjustable airflow dampers.
Not necessarily. A larger free opening can reduce air velocity at the same airflow, but actual noise also depends on construction, damper position and pressure loss.
Its primary purpose is connection airtightness. It can help limit leakage at the joint but does not itself guarantee lower overall ventilation noise.
Sound pressure level describes a noise characteristic, while sound attenuation indicates how much sound is attenuated at specific frequencies. They are not interchangeable.
Yes. Painted metal surfaces can be cleaned periodically using a soft cloth and cleaning products suitable for the coating.
Yes. el-vent.com delivers worldwide. Shipping costs and times depend on the destination and order contents.
el-vent.com supplies Silent DPN, DPNN, DIN and DINN acoustic air diffusers for mechanical ventilation and heat recovery systems in residential, commercial and other premises. The range includes supply, extract and universal models with nominal diameters from Ø80 to Ø200 mm.
We deliver throughout Lithuania and worldwide.
